804978 has 20 divisors (see below), whose sum is σ = 1804110. Its totient is φ = 268272.

The previous prime is 804943. The next prime is 804983. The reversal of 804978 is 879408.

It can be written as a sum of positive squares in only one way, i.e., 762129 + 42849 = 873^2 + 207^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2323 + ... + 2646.

2⁸⁰⁴⁹⁷⁸ is an apocalyptic number.

804978 is an abundant number, since it is smaller than the sum of its proper divisors (999132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

804978 is a wasteful number, since it uses less digits than its factorization.

804978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4983 (or 4974 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 804978 is about 897.2056620419. The cubic root of 804978 is about 93.0239272461.

The spelling of 804978 in words is "eight hundred four thousand, nine hundred seventy-eight".